Jeff Thompson | 86b6d64 | 2013-10-17 15:01:56 -0700 | [diff] [blame] | 1 | // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
| 2 | // (C) Copyright 2004-2007 Jonathan Turkanis |
| 3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
| 5 | |
| 6 | // See http://www.boost.org/libs/iostreams for documentation. |
| 7 | |
| 8 | #ifndef NDNBOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED |
| 9 | #define NDNBOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED |
| 10 | |
| 11 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| 12 | # pragma once |
| 13 | #endif |
| 14 | |
| 15 | #include <memory> // allocator. |
| 16 | #include <ndnboost/iostreams/detail/access_control.hpp> |
| 17 | #include <ndnboost/iostreams/detail/char_traits.hpp> |
| 18 | #include <ndnboost/iostreams/detail/iostream.hpp> // standard streams. |
| 19 | #include <ndnboost/iostreams/detail/push.hpp> |
| 20 | #include <ndnboost/iostreams/detail/select.hpp> |
| 21 | #include <ndnboost/iostreams/detail/streambuf.hpp> // pubsync. |
| 22 | #include <ndnboost/iostreams/filtering_streambuf.hpp> |
| 23 | #include <ndnboost/mpl/and.hpp> |
| 24 | #include <ndnboost/mpl/bool.hpp> |
| 25 | #include <ndnboost/static_assert.hpp> |
| 26 | #include <ndnboost/type_traits/is_convertible.hpp> |
| 27 | |
| 28 | // Must come last. |
| 29 | #include <ndnboost/iostreams/detail/config/disable_warnings.hpp> // MSVC. |
| 30 | |
| 31 | namespace ndnboost { namespace iostreams { |
| 32 | |
| 33 | //--------------Definition of filtered_istream--------------------------------// |
| 34 | |
| 35 | namespace detail { |
| 36 | |
| 37 | template<typename Mode, typename Ch, typename Tr> |
| 38 | struct filtering_stream_traits { |
| 39 | typedef typename |
| 40 | iostreams::select< // Disambiguation for Tru64 |
| 41 | mpl::and_< |
| 42 | is_convertible<Mode, input>, |
| 43 | is_convertible<Mode, output> |
| 44 | >, |
| 45 | NDNBOOST_IOSTREAMS_BASIC_IOSTREAM(Ch, Tr), |
| 46 | is_convertible<Mode, input>, |
| 47 | NDNBOOST_IOSTREAMS_BASIC_ISTREAM(Ch, Tr), |
| 48 | else_, |
| 49 | NDNBOOST_IOSTREAMS_BASIC_OSTREAM(Ch, Tr) |
| 50 | >::type stream_type; |
| 51 | typedef typename |
| 52 | iostreams::select< // Dismbiguation required for Tru64. |
| 53 | mpl::and_< |
| 54 | is_convertible<Mode, input>, |
| 55 | is_convertible<Mode, output> |
| 56 | >, |
| 57 | iostream_tag, |
| 58 | is_convertible<Mode, input>, |
| 59 | istream_tag, |
| 60 | else_, |
| 61 | ostream_tag |
| 62 | >::type stream_tag; |
| 63 | }; |
| 64 | |
| 65 | template<typename Chain, typename Access> |
| 66 | class filtering_stream_base |
| 67 | : public access_control< |
| 68 | ndnboost::iostreams::detail::chain_client<Chain>, |
| 69 | Access |
| 70 | >, |
| 71 | public filtering_stream_traits< |
| 72 | typename Chain::mode, |
| 73 | typename Chain::char_type, |
| 74 | typename Chain::traits_type |
| 75 | >::stream_type |
| 76 | { |
| 77 | public: |
| 78 | typedef Chain chain_type; |
| 79 | typedef access_control< |
| 80 | ndnboost::iostreams::detail::chain_client<Chain>, |
| 81 | Access |
| 82 | > client_type; |
| 83 | protected: |
| 84 | typedef typename |
| 85 | filtering_stream_traits< |
| 86 | typename Chain::mode, |
| 87 | typename Chain::char_type, |
| 88 | typename Chain::traits_type |
| 89 | >::stream_type stream_type; |
| 90 | filtering_stream_base() : stream_type(0) { this->set_chain(&chain_); } |
| 91 | private: |
| 92 | void notify() { this->rdbuf(chain_.empty() ? 0 : &chain_.front()); } |
| 93 | Chain chain_; |
| 94 | }; |
| 95 | |
| 96 | } // End namespace detail. |
| 97 | |
| 98 | // |
| 99 | // Macro: NDNBOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) |
| 100 | // Description: Defines a template derived from std::basic_streambuf which uses |
| 101 | // a chain to perform i/o. The template has the following parameters: |
| 102 | // Mode - the i/o mode. |
| 103 | // Ch - The character type. |
| 104 | // Tr - The character traits type. |
| 105 | // Alloc - The allocator type. |
| 106 | // Access - Indicates accessibility of the chain interface; must be either |
| 107 | // public_ or protected_; defaults to public_. |
| 108 | // Macro parameters: |
| 109 | // name_ - The name of the template to be defined. |
| 110 | // chain_type_ - The name of the chain template. |
| 111 | // default_char_ - The default value for the char template parameter. |
| 112 | // |
| 113 | #define NDNBOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) \ |
| 114 | template< typename Mode, \ |
| 115 | typename Ch = default_char_, \ |
| 116 | typename Tr = NDNBOOST_IOSTREAMS_CHAR_TRAITS(Ch), \ |
| 117 | typename Alloc = std::allocator<Ch>, \ |
| 118 | typename Access = public_ > \ |
| 119 | class name_ \ |
| 120 | : public ndnboost::iostreams::detail::filtering_stream_base< \ |
| 121 | chain_type_<Mode, Ch, Tr, Alloc>, Access \ |
| 122 | > \ |
| 123 | { \ |
| 124 | public: \ |
| 125 | typedef Ch char_type; \ |
| 126 | struct category \ |
| 127 | : Mode, \ |
| 128 | closable_tag, \ |
| 129 | detail::filtering_stream_traits<Mode, Ch, Tr>::stream_tag \ |
| 130 | { }; \ |
| 131 | NDNBOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \ |
| 132 | typedef Mode mode; \ |
| 133 | typedef chain_type_<Mode, Ch, Tr, Alloc> chain_type; \ |
| 134 | name_() { } \ |
| 135 | NDNBOOST_IOSTREAMS_DEFINE_PUSH_CONSTRUCTOR(name_, mode, Ch, push_impl) \ |
| 136 | ~name_() { \ |
| 137 | if (this->is_complete()) \ |
| 138 | this->rdbuf()->NDNBOOST_IOSTREAMS_PUBSYNC(); \ |
| 139 | } \ |
| 140 | private: \ |
| 141 | typedef access_control< \ |
| 142 | ndnboost::iostreams::detail::chain_client< \ |
| 143 | chain_type_<Mode, Ch, Tr, Alloc> \ |
| 144 | >, \ |
| 145 | Access \ |
| 146 | > client_type; \ |
| 147 | template<typename T> \ |
| 148 | void push_impl(const T& t NDNBOOST_IOSTREAMS_PUSH_PARAMS()) \ |
| 149 | { client_type::push(t NDNBOOST_IOSTREAMS_PUSH_ARGS()); } \ |
| 150 | }; \ |
| 151 | /**/ |
| 152 | NDNBOOST_IOSTREAMS_DEFINE_FILTER_STREAM(filtering_stream, ndnboost::iostreams::chain, char) |
| 153 | NDNBOOST_IOSTREAMS_DEFINE_FILTER_STREAM(wfiltering_stream, ndnboost::iostreams::chain, wchar_t) |
| 154 | |
| 155 | typedef filtering_stream<input> filtering_istream; |
| 156 | typedef filtering_stream<output> filtering_ostream; |
| 157 | typedef wfiltering_stream<input> filtering_wistream; |
| 158 | typedef wfiltering_stream<output> filtering_wostream; |
| 159 | |
| 160 | //----------------------------------------------------------------------------// |
| 161 | |
| 162 | } } // End namespace iostreams, boost |
| 163 | |
| 164 | #include <ndnboost/iostreams/detail/config/enable_warnings.hpp> // MSVC |
| 165 | |
| 166 | #endif // #ifndef NDNBOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED |